NP231 vs. NP242 vs. NP249 - Page 2 - JeepForum.com

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post #16 of 29 Old 03-21-2007, 09:36 AM
QuadraTokn
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isnt the rev limiter at 115 mph?


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post #17 of 29 Old 03-21-2007, 09:42 AM
li'l jeep
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Quote:
Originally Posted by quadratokn
isnt the rev limiter at 115 mph?
Don't think so...but maybe i was wrong on my speed, i coulda been doing one ten, i was more worried about whats infront of me...LoL

it was a cluster F of jrzy yellow platers on the northway (I-87 NY state)

and if i do the swap itself, any T-case i get i would send to a trans shop for a rebuild and SYE kit. but the driveshafts would have to be different?

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post #18 of 29 Old 03-21-2007, 09:48 AM
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you must count the splines (gear teeth or w/e) on the old t-case and the new t-case. if they are different, you need to keep the right drive shafts with the right t-case

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post #19 of 29 Old 03-21-2007, 09:50 AM
ArloGuthroJeep
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Please call them input & output shafts, not drive shafts

'04 WJ, 6" Clayton LA's, 242 SYE, 35" BFG MT KM2's, 4.56 gears, & D44a locked
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post #20 of 29 Old 03-21-2007, 09:58 AM
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yes mister, sorry sir.

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post #21 of 29 Old 03-21-2007, 10:21 AM
li'l jeep
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Well my DRIVESHAFTS....lol just playing. okay so match the splines on the in/output shafts.....and what do u mean by w/e?

i know u guys have WJs, but do u know if my ZJ really has a speed limiter?

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post #22 of 29 Old 03-21-2007, 04:16 PM
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Quote:
Originally Posted by li'l jeep
i know u guys have WJs, but do u know if my ZJ really has a speed limiter?
Yeah, it's called weight and aerodynamics...

Seriously though, I know of no speed limiter in my ZJ. Not that it would matter. Gearing runs out pretty quickly.

- Bill (formerly VetteDriver)
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post #23 of 29 Old 03-21-2007, 04:55 PM
li'l jeep
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Quote:
Originally Posted by VetteDriver
Yeah, it's called weight and aerodynamics...
thats not what my buddies in their tahoe were saying when i was doing 110-115 on the Northway...i owned them, sort of....LoL

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post #24 of 29 Old 03-21-2007, 05:09 PM
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Quote:
Originally Posted by li'l jeep
Don't think so...but maybe i was wrong on my speed, i coulda been doing one ten, i was more worried about whats infront of me...LoL

it was a cluster F of jrzy yellow platers on the northway (I-87 NY state)

and if i do the swap itself, any T-case i get i would send to a trans shop for a rebuild and SYE kit. but the driveshafts would have to be different?
could have been looking at the temerature gauge?










(just jokin ya lol)
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post #25 of 29 Old 03-21-2007, 06:18 PM
li'l jeep
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i was wondering why it said i was doing 210 degrees mph...haha really funny!

actually i was happy. all my buddies are chevy guys, and they said my truck looked awesome going that fast, plus i had my cutout open!

anyhoo...anyone have any other thoughts on a 249 to 242 swap?

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post #26 of 29 Old 03-22-2007, 11:27 AM
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The swap from 249 to 242 is the way to go - did it a couple of years ago - the hard way - learned a lot but in the end it is totally worth it - I have a large bit of it outlined on my car domain page - I had to change the planetary gears in the the 242 to my 249 gears - I reused the front half of the 249 as they are the same front half and I could not get the giant gear ring out of either one. I used a case from an 89 cherokee which had a short shaft 21 spline count input shaft. The 93-98 grand cherokee uses a medium shaft 23 spline count input shaft. 93-94 1/2 uses a thick input spine bearing along with pitch of the gears being different from a 94 1/2 and up gear which uses a thin bearing. There is also the issue of outputs. Starting in 1996 Jeep switched from an internal slip yoke to an external slip yoke for the NP231s and NP242s. The NP249s retained their internal slip yokes throughout the 1993-1998 usage.

The easiest way to do this swap is to find a transfer case from the same year you have and simply swap it in - if it is a 96-98 grand you will need the drive shaft along with it because the drive shaft is a different length for each transfer case. (unless you have a lift then it really doesn't matter) I am not sure which is longer or shorter but I just know they are different lengths. Hope this helps.

Scott
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post #27 of 29 Old 03-22-2007, 02:51 PM
li'l jeep
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will my trans shop know these things. meaning is this a decently known fact that people, whos living is trans and transfer cases, know this? i don't plan on doing this myself. i know the cost is much, but i can get a decent deal from the guy i deal with.

so yeah, anyway, whenever i get to this, i guess just supply him with the driveshaft, SYE?, and the 93-98 t-c?

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post #28 of 29 Old 03-25-2007, 06:17 PM
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Top speed has two factors are aerodynamics and horsepower.
(horsepower to the ground has to overcome the aero drag)

Acceleration has two factors Torque and Weight

Just think of a 1/4 mile drag strip.
Drop some weight and the E.T.s drop.
Crank up the horsepower and MPH increases.

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post #29 of 29 Old 06-12-2016, 07:40 PM
03JeepKJ
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Jeep Liberty transfer cases

I currently have a NP231 in my Jeep Liberty. I also have a NP242 that came out of another Liberty that im selling parts off of. I've been wondering if I should go ahead and swap the NP231 for the NP242? I live in upstate NY and want to know how much it would benefit if any?
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